STEVAL-ISA050V1: DDR2/3 Supply


The PM6641 demonstration board is a monolithic voltage regulator (VR) module with internal power MOSFETs, specifically designed to supply DDR2/3 memory and chipset in ultramobile PC and real estate constrained portable systems.

It integrates three independent, adjustable, constant frequency buck converters, a ±2 Apk low dropout (LDO) linear regulator, and a ±15 mA low-noise buffered reference.

Each regulator is provided with basic undervoltage (UV) and overvoltage (OV) protections, programmable soft-start and current limit, active soft-end, and pulse skipping at light loads.


Manufacturer STMicroelectronics
Category AC/DC and DC/DC Conversion
Sub-Category DC/DC SMPS - Multi Output
Eval Board Part Number 497-8425-ND
Eval Board Supplier STMicroelectronics
Eval Board -
Topology Step Down
Outputs and Type 4 Non-Isolated
Voltage Out M: Highest Current First 1.8V, 1.05V, 1.5V, 0.9V
Current Out 4A, 3.5A, 2.5A, 2A
Voltage In 2.7 ~ 3.6 V
Efficiency @ Conditions >85%, 3.3V in, 1.8V @ 2A, 1.5V @ 1.2A, 1.05V @ 1.1A
Voltage Out Range - Not Given
Features Current Limit (Adj. or Fixed)
Light Load Mode
Over Voltage Protection
Power Good Output
Shutdown, Enable, Standby
Soft Start
Thermal Protection
Under Voltage Protection, Brown-Out
Switching Frequency 750 kHz
Standby Current [Typical] - Not Given
Quiescent Current [Typical] - Not Given
Component Count + Extras 51 + 26
Internal Switch Yes
Design Author STMicroelectronics
Application / Target Market Computers
Standby Current [Maximum] 10 µA
Quiescent Current [Maximum] 3 mA
Main I.C. Base Part PM6641
Date Created By Author
Date Added To Library 2011-03

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